Liquid jet engines are the basis of power-plants on modern space-rockets, thats why acoustic non-destructive testing is of great importance in production of engines parts and units and at assembling of engines. Acoustic NDT is implemented for testing of half-finished products (such as rods, castings, sheet metals), weldings and connections. At that pulse-echo and mirror through transmission ultrasonic methods are used. For rods testing special equipment for mechanized ultrasonic testing was developed. This system provides detection of internal defects with double-crystal transducers and of external longitudinal-oriented defects with angle transducers at forward-back movement of rod. The acoustic tensometry is implemented for strain measurements of bolts and studs of plug-type connections. Special system, realizing this method with calibrating stand and methodology of calibration and strain-stress testing was developed. The advantage of this method is an active character of testing, providing optimization of strain tightening of each thread pair and of the whole connection. The results of researches, made on the base of JSC 'JSC 'Glushko Scientific Industrial Association 'Energomash', are the base of industry standard 'Strain tightening of thread connection testing with acoustic methods. As metrological support set of standard samples was developed. The report is devoted to the questions of choice of acoustic NDT methods and means for welds testing, metrological support and technology of ultrasonic testing, gives the statistic data of detected defects, influence of flaw detectors sensitivity and acoustic tensometers accuracy parameters on the operability of welding and plug-type connections. The tasks and perspectives for application of ultrasonic tomographic systems for complex geometry welds testing and ultrasonic tensometers with EMA transducers for plug-type connections are discussed.


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    Title :

    Acoustic non-destructive testing at production of liquid jet engines


    Additional title:

    Akustische zerstörungsfreie Prüfung bei der Fertigung von Flüssigantrieb-Raketentriebwerken


    Contributors:


    Publication date :

    2006


    Size :

    6 Seiten, 6 Bilder, 2 Tabellen, 4 Quellen



    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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